#include "bits/stdc++.h"
using namespace std;

int main() {
	int N;
	cin >> N;
	for (int i = 0; ; i++) {
		if (N == 1) {
			cout << i << endl;
			return 0;
		}
		if (N % 2 == 0) N /= 2;
		else N++;
	}
}